After installing the new beta xCode. The custom font set in an existing project does not work. When opening the storyboard file, it says as shown in image below
After clocking ok, I'm not able to choose custom font from the attribute inspector.
It was working fine with xcode 10.2. This issue occurs only on Xcode 11 beta
I had the same issue after I switched system language, and it was fixed by restarting the system and then restarting Xcode.
I've also had this issue.
I had to change the text style to attributed, pick the font, then change back to plain.
You don't need to restart your system. Just perform these simple steps to solve this issue.
Font Book